RockJock Johnny Joint Billet Aluminum Control Arms

2007–2018 Jeep Wrangler JK 3.6L/3.8L

Part #: CE-9807FLAB

Overview

The RockJock Johnny Joint Billet Aluminum Control Arms are precision-engineered front lower control arms designed specifically for Jeep Wrangler JK and JK Unlimited models from 2007 through 2018 with 3.6L or 3.8L engines. These adjustable control arms are an essential upgrade for off-road enthusiasts and Jeep builders seeking enhanced suspension articulation and improved driveline geometry after installing a suspension lift. Featuring length adjustability, they allow fine-tuning of the pinion angle to optimize drivetrain performance and reduce vibrations.

Built to withstand the rigors of serious off-road use, these control arms combine strength, durability, and style, making them a perfect addition to any JK build focused on both performance and aesthetics.

Key Features

RockJock’s Johnny Joint control arms offer a range of advanced features that set them apart from stock components and other aftermarket options:

• CNC machined from billet 6061-T6 aluminum for superior strength and lightweight performance
• Fully adjustable length design to precisely set pinion angle after suspension lift installation
• Black anodized finish with machined highlights for a sleek, durable appearance
• Double adjustable with right hand/left hand 1 1/4 inch thread Johnny Joint rod ends for precise alignment
• Grade 8 pinch bolts at each end ensure secure, reliable clamping
• Replaceable 4130 chromoly skid plates bolt on to protect the arms and allow easy future replacement if damaged
• Compatible with 37-inch tires on stock width axles and 4 1/2 inch backspace wheels
• Minimum 3/8 inch longer than stock arms to accommodate lifted suspension setups
• Designed to be used in conjunction with adjustable upper control arms for optimal suspension geometry

Construction & Design

Each control arm is crafted from premium billet 6061-T6 aluminum, chosen for its excellent strength-to-weight ratio and corrosion resistance. The CNC machining process ensures tight tolerances and consistent quality across every arm. The black anodized finish not only enhances durability but also provides a striking contrast with the machined highlights, adding a custom look to your Jeep’s suspension.

To protect the arms from trail hazards, RockJock includes heavy-duty 4130 chromoly skid plates that bolt on securely. These skid plates are designed to absorb impacts and can be replaced independently, extending the life of the control arms and reducing maintenance costs.

Installation & Fitment

Installation of the RockJock Johnny Joint control arms is straightforward for experienced mechanics and off-road enthusiasts familiar with suspension upgrades. The arms are designed to fit 2007–2011 Jeep Wrangler models with the 3.8L V6 engine, as well as 2012–2017 and 2018 Jeep Wrangler JK models equipped with the 3.6L V6 engine.

Because these arms are longer than stock by at least 3/8 inch, they require the use of adjustable upper control arms to maintain proper suspension geometry. They are compatible with 37-inch tires on stock width axles paired with 4 1/2 inch backspace wheels. For larger tires, a wider axle or wheel spacers will be necessary to avoid clearance issues.

What’s Included

• Pair of RockJock Johnny Joint billet aluminum front lower control arms
• Right hand/left hand 1 1/4 inch thread Johnny Joint rod ends installed
• Grade 8 pinch bolts for secure mounting
• Replaceable 4130 chromoly skid plates with mounting hardware

Ideal For

This set of adjustable billet aluminum control arms is ideal for Jeep Wrangler JK owners who have installed or plan to install a suspension lift and want to maintain or improve driveline angles and suspension performance. Off-road enthusiasts seeking durable, high-quality components that combine strength, adjustability, and style will appreciate these arms. They are also well suited for custom Jeep builds where both functionality and appearance are priorities.

RockJock 4x4 by John Currie develops trail-proven suspension and steering components for Jeeps and modern off-road platforms, including complete lift systems and the well-known AntiRock sway bar setups. Built around durable, articulation-friendly designs, RockJock is a go-to for enthusiasts who want confident road manners and real capability when the terrain gets technical.